High Volume Low Pressure Air From High Pressure Air + Jet-Ejector

The steam jet or air jet vacuum pump is well known.
On the exit side of the mass balance there should a lot of
applications for low pressure air at a high volumetric flow rate by
coming off a high pressure supply line with a jet ejector.
The overall efficiency should be quite high.
This is something that could have been common over a hundred years ago
and may be dirt cheap off the shelf today.
I just haven't heard of it.
Bret Cahill
Reply to
Bret Cahill
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Bret Cahill wrote in news:34651f13-edc5-4621- snipped-for-privacy@a19g2000prj.googlegroups.com:
The principle is used on many OSHA approved air blowguns where they both increase volume and restrict pressure as a safety byproduct.
Reply to
Charly Coughran
Dear Bret Cahill:
Yep, used for conveying parts, blowing / cooling areas, and a low grade "vacuum cleaner" (lift peanuts, or blow ceiling insulation).
Absolutely horrible, as is any application involving compressed air. Its just that the working fluid is ready available, and easy to clean up.
May be that old...
Where have you been? Under a rock?
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and dozens more.
David A. Smith
Reply to
dlzc
Used as a thrust augmentation device in several applications. AIAA OURNAL OF PROPULSION AND POWER 2010 vol. 26 no. 6 Ejector Thrust Augmentation pages (1325-1330) W. H. Heiser
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Reply to
me
In article , Bret Cahill wrote:
For one, you don't get high-pressure air for nothing.
Isaac
Reply to
isw
Dear Bret Cahill:
Liquid, not gas.
Compressed air is ~42% lost energy in the adiabatic compression cycle, no choice.
Sorry it doesn't meet your needs. But that is far as this "high efficiency" method can take you.
To get more, you'll need methods similar to that used in a scramjet, and that will be lossy, and your gas will be just a bit warmer. The "nerf balls" will be smoking.
David A. Smith
Reply to
dlzc

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